All credit goes to gfocus on a Chinese community forum. I only translated the data to English.
DISCLAIMER: USE THIS AT YOUR OWN RISK. I AM NOT RESPONSIBLE FOR ANY LOSS OF DPS OR RAGE INDUCED DUE TO WRONG INTERPRETATION OF THE DATA OR INACCURATE DATA.
Original thread:
http://bbs.d.163.com/forum.php?mod=viewthread&tid=172915447
This is an exhaustive list of all spender setups on the 2.1 PTR, up to a maximum of 3 spenders slotted.
It displays the number of spender and the number of regular bolts fired in a 30-second cycle for each setup. I find the table extremely useful to min/max my output.
UPDATE: It looks like there are some inaccurate data regarding BP6 & 7 (frame 18 & 12), according to Nyan. Test it yourself if you care enough. Otherwise, it should still roughly give you an idea without being too far off.
1 spender:
http://imgur.com/T1KaK3J
2 spenders:
http://imgur.com/KgmGnjU
3 spenders:
http://imgur.com/p1nAOPG
Abbreviations:
BP = Breakpoint
CA = Cluster Arrow
MS = Multishot
Imp = Impale
Chak = Chakram
EA = Elemental Arrow
Bolts = Sentry auto attack. Note that EA or Chakram will completely replace bolts should you use them.
BP table for reference:
BP.......APS (rounded to 3 dp)
1.........1.102
2.........1.256
3.........1.459
4.........1.742
5.........2.160
6.........2.842
7.........4.154
If you don't know the basic mechanics of sentry attack speed breakpoints,
please refer to Jaybird's "The Tao of Sentries" thread:
http://us.battle.net/d3/en/forum/topic/12945884471